CN111936769A - Vent structure and vent cover - Google Patents
Vent structure and vent cover Download PDFInfo
- Publication number
- CN111936769A CN111936769A CN201980024472.1A CN201980024472A CN111936769A CN 111936769 A CN111936769 A CN 111936769A CN 201980024472 A CN201980024472 A CN 201980024472A CN 111936769 A CN111936769 A CN 111936769A
- Authority
- CN
- China
- Prior art keywords
- region
- barrier portion
- housing
- vent
- space
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/027—Gearboxes; Mounting gearing therein characterised by means for venting gearboxes, e.g. air breathers
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Details Of Gearings (AREA)
Abstract
A vent structure having: a ventilation path having a vertical flow space defined by a circumferential surface including a first region and a second region that face each other and extending in a vertical direction; a first barrier portion disposed in the vertical flow space so as to intersect the vertical direction, and protruding from the first region to the second region; and a second barrier portion disposed above the first barrier portion, intersecting the vertical direction in the vertical flow space, and protruding from the second region toward the first region.
Description
Technical Field
The present disclosure relates to a vent structure and a vent cover that can suppress variation in internal pressure of a case that stores lubricating oil in an inner space of the case.
Background
The lid is formed with an air release hole for adjusting the internal pressure, which communicates the inside and outside of the case, thereby preventing the pressure in the case from rising during operation. A plate member is provided in the ventilation chamber of the cylinder. The plate members are provided in plurality along the extending direction of the cylindrical portion, and through holes are formed at the distal ends of the plate members. The plate member has a function of separating air and oil in order to discharge the air inside to the outside and circulate the lubricating oil inside.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2015-48926
Disclosure of Invention
[ problem to be solved by the invention ]
In the structure of patent document 1, since the through-hole formed in the plate member is used as the ventilation portion, there is a possibility that the highly viscous lubricating oil stirred up by the gear or the like in the housing (casing) adheres to the plate member so as to block the through-hole. In this case, if the diameter of the through hole is small, the function of reducing the internal pressure of the housing is impaired by maintaining the blockage of the through hole by the lubricating oil. On the other hand, if the diameter of the through hole is made large so that the through hole is not clogged with the lubricating oil, the lubricating oil stirred up by the gear or the like may flow from the through hole to the outside of the housing. That is, in the structure in which the through hole of the plate member is used as the ventilation portion, it is difficult to prevent the outflow of the lubricating oil without impairing the function of suppressing the increase in the internal pressure of the housing.
Accordingly, the present disclosure provides a vent structure and a vent cover that can reliably suppress an increase in internal pressure of a housing and prevent outflow of lubricating oil.
[ means for solving the problems ]
A first aspect of the present invention is a vent structure that can suppress variation in internal pressure of a case that stores lubricating oil in a case space, the vent structure including a vent path, a plate-shaped first barrier portion, and a plate-shaped second barrier portion. The ventilation path has a vertical flow space, and communicates an internal opening, which is disposed above the liquid surface of the lubricating oil and opens into the housing space, with an external opening, which opens to the outside of the housing, via the vertical flow space. The vertical flow space is defined by a circumferential surface including a first region and a second region that face each other, and extends in the vertical direction. The first barrier portions are arranged in the vertical flow space so as to intersect the vertical direction and protrude from the first region toward the second region. The second barrier portion is disposed above the first barrier portion, intersects the vertical direction in the vertical flow space, and protrudes from the second region toward the first region. In the up-down circulation space, air circulates between the first barrier portion and the second region, and between the second barrier portion and the first region.
In the above configuration, the air passing through the space in the housing is discharged from the ventilation path to the outside of the housing, thereby suppressing an increase in the internal pressure of the housing (the pressure in the space in the housing).
Most of the lubricating oil stirred up by the gears and the like in the housing space and opened to the inside is prevented from moving to the outside opening side by the first barrier portion and the second barrier portion, and returns to the housing space. Therefore, the lubricating oil can be prevented from flowing out from the external opening by the first barrier portions and the second barrier portions.
Since the space between the first barrier portion and the second region and the space between the second barrier portion and the first region are each defined as a ventilation portion, the state of the ventilation portion is less likely to be blocked by the adhered lubricant plug than a structure in which a through hole formed in the plate-like member is defined as a ventilation portion. Therefore, ventilation from the internal opening to the external opening can be maintained, and the increase in the internal pressure of the housing can be reliably suppressed.
The second scheme of the invention is as follows: in the vent hole structure according to the first aspect, the second barrier portion is inclined downward toward the first region.
In the above configuration, even when the lubricant oil enters the outer opening side beyond the second barrier portion, the lubricant oil easily flows down on the upper surface of the second barrier portion inclined downward toward the first region and moves toward the inner opening side. Therefore, the outflow of the lubricating oil from the external opening can be more reliably prevented.
The third scheme of the invention is as follows: in the vent hole structure according to the first or second aspect, the front end edge of the first barrier portion and the front end edge of the second barrier portion form a through region that continues linearly in the vertical direction in the vertical flow space.
In the above configuration, since the through region that is linearly continuous in the vertical direction from below the first barrier portion to above the second barrier portion is provided in the vertical flow space, air can be smoothly circulated in the vertical flow space, and an increase in the internal pressure of the casing can be more reliably suppressed.
The fourth scheme of the invention is as follows: the vent hole structure according to any one of the first to third aspects includes a buffer space provided in the vent path on the outer opening side of the second barrier portion, and capable of retaining the lubricating oil that has entered the outer opening side beyond the second barrier portion.
In the above-described configuration, since the buffer space capable of retaining the lubricating oil that has entered the outer opening side beyond the second barrier portion is provided, the lubricating oil is less likely to move toward the outer opening side than the buffer space. Therefore, the outflow of the lubricating oil from the external opening can be more reliably prevented.
The fifth scheme of the invention is as follows: the vent hole cover is attached to the vent hole of the housing for suppressing variation in internal pressure of the housing for storing lubricating oil in a housing space for accommodating a drive device of a vehicle, and includes the vent hole structure according to any one of the first to fourth aspects.
The sixth scheme of the invention is as follows: in the vent cover of the fifth aspect, the drive device is a differential gear, and the housing is an axle housing that houses the differential gear.
In the above configuration, the vent hole cover is attached to the vent hole of the housing, so that the vent hole structure according to any one of the first to fourth aspects can be provided to the housing. Therefore, the vent hole structure of a desired structure can be provided in the case without complicating the shape of the case, the vent hole structure can be made of a material different from that of the case, the vent hole structures of different structures can be easily provided in the case of the same shape, and when the vent hole structure is damaged, the replacement of the entire case can be eliminated.
[ Effect of the invention ]
According to the present disclosure, it is possible to reliably suppress an increase in the internal pressure of the housing and prevent outflow of the lubricating oil.
Drawings
Fig. 1 is a side view of an axle housing to which a vent cover according to an embodiment of the present invention is attached.
Fig. 2 is a plan view of the axle housing of fig. 1 as viewed from the direction of arrow II.
FIG. 3 is a sectional view looking in the direction III-III of the vent cover of FIG. 2.
Figure 4 is a cross-sectional view of the vent cover of figure 2 looking in the direction IV-IV.
Fig. 5 is a bottom view of the vent cover of fig. 3, as viewed in the direction of arrow V.
Detailed Description
Hereinafter, an embodiment of the present invention will be described in detail with reference to fig. 1 to 5.
As shown in fig. 1 and 2, a high-viscosity lubricating oil 4 for lubricating a differential gear 3 of a vehicle is stored in an internal space (housing internal space) 2 of an axle housing (housing) 1 that houses the differential gear 3. The axle housing 1 is provided with a lubricant oil discharge port 5 communicating with the outside at the bottom of the housing space 2, and a lubricant oil supply port 6 communicating with the housing space 2 and the outside at a position higher than the lubricant oil discharge port 5, and the lubricant oil discharge port 5 and the lubricant oil supply port 6 are closed by closing covers 7 and 8, respectively, except for the supply and discharge of the lubricant oil 4. By supplying the lubricant oil 4 from the lubricant oil supply port 6 in a state where the lubricant oil discharge port 5 is closed, the lubricant oil 4 is stored in the housing space 2. The differential gear 3 rotates in a state where at least a part thereof is immersed in the lubricating oil 4, and the lubricating oil 4 is stirred up by the rotating differential gear 3. Note that the differential gear 3 is not illustrated in detail.
The axle housing 1 is formed with a vent hole 10 (see fig. 3) that communicates the housing space 2 with the outside above the liquid surface 9 of the lubricating oil. The vent hole 10 is provided with a vent hole cover 11 that prevents the stirred lubricating oil 4 from flowing out to the outside and suppresses variation in the internal pressure of the axle housing 1 (the pressure of the housing internal space 2). In a cap-mounted state in which the vent hole cover 11 is mounted on the vent hole 10, the space between the vent hole 10 and the vent hole cover 11 is sealed by a sealing member (not shown) or the like.
As shown in fig. 3 to 5, the vent cover 11 integrally includes a cylindrical cover lower portion 12 inserted into the vent hole 10 and a box-shaped cover upper portion 13 communicating with the upper end side of the cover lower portion 12, and defines a vent passage 17, and the vent passage 17 communicates a cover lower end opening (inner opening) 14 of the cover lower portion 12 and a vent pipe connection opening (outer opening) 15 of the cover upper portion 13 via an upper and lower flow space 16. The vertical flow space 16 is defined by an inner peripheral surface (circumferential surface) 18 of the lid lower portion 12 and extends in the vertical direction in the lid attached state. The cap lower end opening 14 opens the lower end of the vertical flow space 16 into the housing space 2 above the liquid surface 9 of the lubricating oil 4 in the housing space 2.
The inner peripheral surface 18 of the lid lower portion 12 includes a first region 20 and a second region 21 that face each other, and a first barrier portion 22 having a flat plate shape and a second barrier portion 23 having a flat plate shape are provided in the vertical flow space 16. The first barrier portions 22 are arranged substantially orthogonal to the vertical direction (vertical direction), protrude from the first region 20 toward the second region 21, and extend substantially horizontally. The second barrier portions 23 are arranged above the first barrier portions 22 so as to intersect the vertical direction, protrude from the second region 21 toward the first region 20, and extend obliquely downward. In the up-down flow space 16, air passes between the first barrier portion 22 and the second region 21, and between the second barrier portion 23 and the first region 20.
A first notch-shaped concave portion 24 recessed toward the first region 20 side is formed at the leading end edge of the first barrier portion 22, and a second notch-shaped concave portion 25 recessed toward the second region 21 side is formed at the leading end edge of the second barrier portion 23. The first recessed portion 24 and the second recessed portion 25 form a through region 26 that is linearly continuous in the vertical direction in the vertical flow space 16, and when the cap lower end opening 14 is viewed from below, the top surface of the ventilation path 17 above the second barrier portion 23 is exposed via the through region 26 (see fig. 5). Whether or not the distal end side of the first barrier portion 22 excluding the first recess 24 and the distal end side of the second barrier portion 23 excluding the second recess 25 overlap in the vertical direction is arbitrary, and in the present embodiment, the distal end edges of both portions are set so as to substantially overlap in the vertical direction (substantially coincide when viewed from the vertical direction).
The breather pipe connection port 15 is provided at an end portion of the cover upper portion 13 that is separated from the communication portion 27 of the cover lower portion 12 and the cover upper portion 13, and opens to the outside of the axle housing 1. A breather pipe 28 is connected to the breather pipe connection port 15, and an open end (not shown) of the breather pipe 28 is supported on the vehicle body side at a predetermined position (a height position at which the vehicle does not fall in the water when traveling in a water route) higher than the breather pipe connection port 15.
The internal space of the lid upper portion 13 is a space provided in the ventilation passage 17 on the ventilation pipe connection port 15 side of the second barrier portion 23, and functions as a buffer space 29, and the buffer space 29 can retain the lubricating oil 4 that has entered the ventilation pipe connection port 15 side beyond the second barrier portion 23. The bottom surface portion 30 of the lid upper portion 13 is a flat plate shape extending substantially horizontally from the communication portion 27 side to the breather pipe connection port 15 side, and the lower side of the buffer space 29 is defined by the bottom surface portion 30 of the lid upper portion 13.
According to the present embodiment, the air passing through the interior space 2 is discharged to the outside from the vent passage 17 of the vent cap 11, thereby suppressing an increase in the internal pressure of the axle housing 1 (the pressure of the interior space 2).
The lubricant oil 4 in the housing space 2 may be stirred up by the differential gear 3 or the like and a part thereof may be directed toward the cap lower end opening 14, but most of the lubricant oil 4 directed toward the cap lower end opening 14 is prevented from moving toward the breather pipe connection port 15 side by the first barrier portion 22 and the second barrier portion 23 and returns to the housing space 2. Therefore, the outflow of the lubricant oil 4 from the air pipe connection port 15 can be prevented by the first barrier portion 22 and the second barrier portion 23.
Since the space between the first barrier portion 22 and the second region 21 and the space between the second barrier portion 23 and the first region 20 are defined as the ventilation portions, the blockage of the ventilation portions by the adhered lubricant oil 4 is less likely to occur than in the case where the through-holes formed in the plate-like member are defined as the ventilation portions. Therefore, ventilation from the cap lower end opening 14 to the ventilation pipe connection port 15 can be maintained, and an increase in the internal pressure of the axle housing 1 can be reliably suppressed.
The second barrier portion 23 on the side of the breather pipe connection port 15 of the first barrier portion 22 and the second barrier portion 23 is inclined downward toward the first region 20, and therefore even when the lubricant oil 4 passes over the second barrier portion 23 and enters the breather pipe connection port 15 side, the lubricant oil 4 tends to flow down on the upper surface of the second barrier portion 23 inclined downward and move toward the lid lower end opening 14 side. Therefore, the lubricant oil 4 can be more reliably prevented from flowing out from the breather pipe connection port 15.
Since the through region 26 that is linearly continuous in the vertical direction from below the first barrier portion 22 to above the second barrier portion 23 is provided in the vertical flow space 16, air can be smoothly flowed through the vertical flow space 16, and an increase in the internal pressure of the axle housing 1 can be more reliably suppressed.
Since the buffer space 29 capable of retaining the lubricating oil 4 that has entered the breather pipe connection port 15 side beyond the second barrier portion 23 is provided, the lubricating oil 4 is less likely to move toward the breather pipe connection port 15 side than the buffer space 29. Therefore, the lubricant oil 4 can be more reliably prevented from flowing out from the breather pipe connection port 15.
Further, since the vent hole 10 is formed in the axle housing 1 and the vent hole cover 11 is attached to the vent hole 10, and the vent hole structure (the vent path 17, the first barrier portion 22, and the second barrier portion 23) is provided in the axle housing 1, it is possible to provide the desired vent hole structure in the axle housing 1 without complicating the shape of the axle housing 1, to provide the vent hole structure with a material different from that of the axle housing 1, to easily provide the vent hole structure with a different structure in the axle housing 1 having the same shape, and to replace only the vent hole cover 11 without replacing the axle housing 1 when the vent hole structure is broken.
The present invention has been described above based on the above embodiments, but the present invention is not limited to the contents of the above embodiments, and it goes without saying that the present invention can be appropriately modified within a range not departing from the scope of the present invention. That is, it is needless to say that other embodiments, examples, application techniques, and the like obtained by those skilled in the art based on the embodiments are all included in the scope of the present invention.
For example, the vent hole cover 11 may be omitted, and the vent hole structure may be formed directly on the axle housing 1.
The barrier portion provided in the vertical flow space 16 is not limited to two, three or more, and may be set in any shape.
The housing provided with the vent structure is not limited to the axle housing 1 accommodating the differential gear 3, and may be a housing accommodating another driving device (e.g., a transfer case, a final drive transmission, etc.).
Industrial applicability of the invention
The present invention can be applied to a casing storing lubricating oil in a casing space.
The present application is based on the japanese patent application published on 6/4/2018 (japanese application 2018-073765), the content of which is hereby incorporated by reference.
Description of the reference numerals
1: axle case (outer cover)
2: space in the housing
3: differential gear
4: lubricating oil
5: lubricating oil outlet
6: lubricating oil supply port
7. 8: closing cover
9: level of lubricating oil
10: vent hole
11: vent hole cover
12: lower part of the cover
13: cover upper part
14: lower end opening of cover (inner opening)
15: vent pipe connector (external opening)
16: upper and lower flow spaces
17: ventilation path
18: inner peripheral surface of the cover lower part (circumference)
20: first region
21: second region
22: the first barrier portion
23: the second barrier portion
24: first concave part
25: second concave part
26: through region
27: communicating part
28: vent pipe
29: buffer space
30: bottom surface part of the cover upper part
Claims (6)
1. A vent structure capable of suppressing variation in internal pressure of a housing storing lubricating oil in a housing space, comprising:
a ventilation path having a vertical flow space defined by a circumferential surface including a first region and a second region that face each other and extending in a vertical direction, the ventilation path communicating an internal opening that is disposed above a liquid surface of the lubricating oil and opens into the internal housing space and an external opening that opens to an outside of the housing, via the vertical flow space;
a plate-shaped first barrier portion that is disposed in the vertical flow space so as to intersect the vertical direction and protrudes from the first region toward the second region; and
a plate-shaped second barrier portion that is arranged above the first barrier portion, intersects with the vertical direction in the vertical flow space, and protrudes from the second region toward the first region,
in the upper and lower circulation spaces, air circulates between the first barrier portion and the second region, and between the second barrier portion and the first region.
2. The vent structure according to claim 1,
the second barrier portion is inclined downward toward the first region.
3. The vent structure according to claim 1 or claim 2,
the front end edge of the first barrier portion and the front end edge of the second barrier portion form a through region that is continuous linearly in the vertical direction in the vertical flow space.
4. A vent structure according to any one of claims 1 to 3,
the oil supply device includes a buffer space provided in the air passage on the outer opening side of the second barrier portion, and capable of retaining the lubricating oil that has entered the outer opening side beyond the second barrier portion.
5. A vent cap mounted on a vent hole of a housing for storing lubricating oil in a housing space for accommodating a drive device of a vehicle, in order to suppress variation in internal pressure of the housing,
a vent structure comprising any one of claim 1 to claim 4.
6. The vent cover of claim 5,
the drive means are a differential gear which is,
the housing is an axle housing that houses a differential gear.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-073765 | 2018-04-06 | ||
| JP2018073765A JP7104893B2 (en) | 2018-04-06 | 2018-04-06 | Breather structure and breather cover |
| PCT/JP2019/014671 WO2019194191A1 (en) | 2018-04-06 | 2019-04-02 | Breather structure and breather cover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111936769A true CN111936769A (en) | 2020-11-13 |
| CN111936769B CN111936769B (en) | 2023-10-27 |
Family
ID=68100278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980024472.1A Active CN111936769B (en) | 2018-04-06 | 2019-04-02 | Vent structure and vent cover |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7104893B2 (en) |
| CN (1) | CN111936769B (en) |
| WO (1) | WO2019194191A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7329426B2 (en) | 2019-11-29 | 2023-08-18 | エイブリック株式会社 | Power management device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013053714A (en) * | 2011-09-06 | 2013-03-21 | Suzuki Motor Corp | Air breather structure of transmission |
| CN104080290A (en) * | 2013-03-26 | 2014-10-01 | 日东电工株式会社 | Ventilation member |
| CN204403341U (en) * | 2014-12-19 | 2015-06-17 | 徐州徐工传动科技有限公司 | A kind of porous plug |
| JP2017172593A (en) * | 2016-03-18 | 2017-09-28 | トヨタ自動車株式会社 | Power transmission device |
-
2018
- 2018-04-06 JP JP2018073765A patent/JP7104893B2/en active Active
-
2019
- 2019-04-02 CN CN201980024472.1A patent/CN111936769B/en active Active
- 2019-04-02 WO PCT/JP2019/014671 patent/WO2019194191A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013053714A (en) * | 2011-09-06 | 2013-03-21 | Suzuki Motor Corp | Air breather structure of transmission |
| CN104080290A (en) * | 2013-03-26 | 2014-10-01 | 日东电工株式会社 | Ventilation member |
| CN204403341U (en) * | 2014-12-19 | 2015-06-17 | 徐州徐工传动科技有限公司 | A kind of porous plug |
| JP2017172593A (en) * | 2016-03-18 | 2017-09-28 | トヨタ自動車株式会社 | Power transmission device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2019183925A (en) | 2019-10-24 |
| JP7104893B2 (en) | 2022-07-22 |
| CN111936769B (en) | 2023-10-27 |
| WO2019194191A1 (en) | 2019-10-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2014017301A1 (en) | Baffle plate and transmission with same | |
| CN108930779B (en) | Lubricating structure of transmission | |
| US20050107202A1 (en) | Automatic transmission oil leak prevention device | |
| CN111936769A (en) | Vent structure and vent cover | |
| CN108691991A (en) | Air-breather | |
| EP1314896A2 (en) | Reservoir having a ventilating structure | |
| JP2014119084A (en) | Differential device for vehicle | |
| US20180283533A1 (en) | Control device unit installation structure for transmission | |
| JP4395723B2 (en) | Breather device for transmission | |
| US20080115847A1 (en) | Oil suction device for automatic transmission | |
| JP5071227B2 (en) | Pump device | |
| CN114076252A (en) | Lubricant pump | |
| JP2018100636A (en) | Flow control valve | |
| JPH0114472B2 (en) | ||
| CN109690139B (en) | Ventilation chamber structure | |
| CN208816650U (en) | Gear drive ventilation device with pull-fork assembly | |
| CN107709839B (en) | Gear device for railway vehicle | |
| CN110486395B (en) | Sealing device for dynamic storage | |
| US10030759B2 (en) | Breather device | |
| JP2008133902A (en) | Oil suction performance improving type strainer structure for driving system for vehicle | |
| KR20200142802A (en) | Oil lubrication apparatus for all wheel driving system | |
| CN113048225A (en) | Gear device for railway vehicle | |
| CN211501593U (en) | Baffle plate and transmission with same | |
| CN211599490U (en) | Respirator device | |
| CN110894874A (en) | Pump unit for providing hydraulic pressure for actuating an actuator in a motor vehicle drive train |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |